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Rateless codes mitigation technique in a turbulent indoor Free Space Optics link

机译:动荡的室内自由空间光学链路中的无速率代码缓解技术

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Free Space Optics (FSO) links are affected by several impairments and, among them, optical turbulence is the most important factor that can degrade the link quality. Due to the presence of this phenomenon, the signal irradiance detected by the receiver fluctuates, thus causing erasure errors and fading events. In this work, we present an indoor Free Space Optics link, in which several turbulence conditions are generated by using two heating elements. We show that the generated turbulence causes erasure errors and packet losses during the data transmission, and we also compare the statistical distribution of the samples with the theoretical models. Moreover, we demonstrate how the application of the most recent rateless codes, i.e., RaptorQ codes, can strongly improve the link quality. In particular, results show that the Packet Error Rate strongly decreases when employing RaptorQ codes. Finally, we conclude that, by properly setting the encoding/decoding parameters, we can correctly receive the whole transmitted data without any errors.
机译:自由空间光学(FSO)链路会受到多种损害的影响,其中,光学湍流是会降低链路质量的最重要因素。由于这种现象的存在,接收器检测到的信号辐照度会发生波动,从而导致擦除错误和衰落事件。在这项工作中,我们提出了一个室内自由空间光学链接,其中使用两个加热元件会产生几种湍流条件。我们证明了所产生的湍流会在数据传输过程中引起擦除错误和数据包丢失,并且还将样本的统计分布与理论模型进行了比较。此外,我们演示了如何应用最新的无速率代码,即RaptorQ代码,可以极大地改善链接质量。具体而言,结果表明,在使用RaptorQ码时,包错误率大大降低。最后,我们得出结论,通过正确设置编码/解码参数,我们可以正确接收整个传输的数据而没有任何错误。

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